Bobbin winder for sewing machine



Feb. 7, 1956 s. .1. HAMLETT 2,733,868

BOBBIN WINDER FOR SEWING MACHINE Filed June 50, 1954 \M NJ INVEN TOR.570mg) J/Mmurrr nited States Parent 2,733,868 nonnmwmnnn FOR SEWINGMACHINE Sidney J. Hamlett, Parma, Ohio, assignor to White Sewing.Machine Corporation, Lakewood, Ohio, a corporation of DelawareThepresent invention relates to sewing machines and more particularly tobobbin-winders for sewing machines.

It is an object of the present invention to provide a new andjmprovedbobbin winder which will automatically stop itselfafter a predeterminedamount of material is wound upon the bobbin. I V

'It is a furtherobject of the present invention to provide a new andimproved device of the above type which can be placedinto its operatingand/ or non-operating position with a minimum ofeffort and attention byan operator.

It is a more particular object of the present invention to "providea'new'and improved device'of the above type which utilizes a spring to'urge the device into both its 'operatingand non oper'ating positions.

"j'The invention resides in'certain constructions and combinationsand'arrangements of parts and further objects and advantages will beapparent to thoses'killed in the art to which it relates'froni thefollowing description of the preferred embodiment describedwithreference to the accompanying drawings forming a part of thisspecification, in which;

Fig. l of the drawing is a side elevational view of a sewing machineembodying the present invention and showing parts thereof in section;

Fig. 2 is an end elevational view of Fig. 1.

Referring to the drawing, a bobbin winding device embodying thepresentinvention is shown mounted on a sewing machine head 10 which carries orhas mounted thereon a handwheel 11 rotatable by the driving mechanism ofthe sewing machine as is well understood in the art. A boss 12 on theend surface of the base structure 10 beneath the handwheel 11 is drilledand tapped to received machine screw 14 which serves as a pivotalconnection for the bobbin winding device 20 of the present invention.

The lever arm 21 of the device has a hub 22 at its lower end which isdrilled and counterbored in a manner permitting the hub to be pivotablyconnected to the sewing machine base by means of machine screw 14. Theother end of the arm 21 is adapted to extend adjacent the handwheel 11of the sewing machine and terminates in a bearing boss or sleeve 23which is adapted to journal a bobbin driving spindle 24. A rubber-tiredfriction wheel 25 is fixed to the spindle 24 on one side of the hub anda collar 26 is secured on the spindle 24 and is positioned adjacent theother side of the hub 23 to hold the spindle against axial displacementduring its rotation. The rubber-tired frictional wheel 25 is adapted torest against the surface of the handwheel 11 when the arm 21 is swunginto its upper operating position adjacent the handwheel 11 and theother end of the spindle 24 is adapted to frictionally retain and drivea conventional sewing machine bobbin B.

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moved to the opposite side of the predetermined position. Asillustrative of one form of spring means that can be utilized, spring 27is shown in the form of a U-shaped compression spring having one endpivotably anchored in hole 28 of the lever arm and the other endpivotably connected to the sewing machine head by means of 'a loop aboutthe enlarged shank portion 29 ofa pin 30. The thread portion 31 of thepin terminates short of the enlarged shank portion 29 and prevents theloop of the spring from being clamped between the sewing machine headand the head 32 of the pin.

Spring 27 may be of various sizes and shapes. To increase theflexibility of the U-shaped-spring shownin the drawing, one or morecoils are provided at thebottom or bight of the U of the spring. Hole 28and pin 30 have been so positioned and the spring 27 -so arranged thatthe lever arm 21 will be forced by the springaction into its inactiveposition adjacent the stop S when the arm is moved counterclockwisemanually from substantially an operative position to just below the lineCC shown in Fig. 2 and then released. Conversely, when the arm is movedclockwise manually from its inactive position just past or upwardly ofthe line C--C and then released, the spring thereafter automaticallyforces the arm into its operating position.

Attached to the sewing machine base is a rigid feeler arm or brakingelement 34 having a hat blade portion 35 adapted to engage materialwound upon the bobbin, when it reaches a predetermined diameter. A spoolof thread indicated by dot-dash lines is shown slipped over a pin 36.The bobbin winding operation is started by passing thread from the spoolthrough a thread tensioning device 37 and coiling its end upon aconventional bobbin B; The lever arm of the device is then moved intoits operating position and the thread is coiled upon the bobbin until itbegins to bear against the blade 35 which is positioned between theflanges of the bobbin. Continued build-up of thread increases thefrictional drag between the thread and the blade and also graduallyforces the arm to move slightly counter-clockwise to reduce the drivingfriction between the wheel 25 and the handwheel of the machine. Thisprocess continues until the friction drive between the handwheel and therubber-tired friction wheel 25 is offset by the friction drag betweenthe coiled thread and the blade at which time rotation ceases.

One of the advantages of the device is its simplicity of operation. Itwill be seen that the device although extremely simple requires aminimum of attention by an operator, and that, the operators eyes neednot be moved from the needle bar of the machine when it is time to movethe arm into its inoperative position. The operator may of course at hisdiscretion allow the device to stay'in its operating position until hissewing operation is completed, or he may simply raise his hand andstrike the arm if he chooses to move it into its inoperative position.It will further been seen that the device can be moved into itsoperative position with equal ease and rapidity of movement.

From the foregoing description of the preferred embodiment it will beapparent that the advantages of the invention heretofore enumerated andothers have been accomplished, and that there has been provided a newand improved bobbin winding device which automatically stops itself whenits coiled material reaches a predeter' mined diameter and which can bemoved into either its operative or non-operative positions by a mereflick of the hand.

- While the invention has been described with considerable detail it isnot limited to the particular, constructions shown, and it is myintention to cover hereby all adaptations, modifications, and usesthereof which come within the-practiceiofthose skilled in the art towhich it relates 32.Wiihi9t1lfi s en h appended a m Having' thusdescribed my invention, I claim:

1. A bobbin winder for a sewing machine comprising sewing maehine-andprovided at its other'end with a-rotatahlexsn n le a p e omou a bob n, afric on whe attached tosaidspindleand adapted to be moved by said rmbetween an inactive position away from a drivember mounted on the headof the sewing machine and; n operating position wherein said wheelengages the drrvingmember, and spring means connected to the sewingmachine headand to the lever arm and functioning on one side of apredetermined position of said lever arm to move the latter toandmaintain the latter in a position Whereinihe friction wheel engagesthe driving member and f nctioning onthe other side of saidpredetermined 'on to move the same to and maintain it in the inactiveposition of the friction wheel away from the drivin me'm er- A bobbinwinder fora sewing machine comprising agieverpivotably mounted at oneend to the head ofga sewing'machine and provided at its other end with arotatable spindle and adapted to mount a bobbin, a friction wheelattached to said spindle and adapted to be moved by saidglever armbetween an inactive position away from a rlriving member mounted on thehead of the sewing machine and an operating position wherein said wheelengages the driving member, and a U-shaped spring con: nected to thesewing machine head at one end and to the lever arm at its other end andfunctioning on one side of ;a predetermined position of said lever armto move the latter to and maintain the latter in'a position wherein thefriction wheel engages the driving member and functioning on theotherside of said predetermined position to move the same to andmaintain it in the inactive position 0f: tl1 e friction-wheel away fromthe driving member.

. 53 LA bobbin winder for a sewing machine comprising a lever pivotablymounted at one end to the head of a sewingmachine and provided at itsother end with a rotatablels pindle and adapted to mount a bobbin, afriction engages the driving member, and a U-shaped compressionspringone end of which is attached to said armintermea on one side of apredetermined ppsitionof e nst h acti n, of .sai 'epr ng mean t 4* diateits pivoted connection and its spindle and the other end of which isattached to the sewing machine head intermediat the' operating'andinactive positions of "the lever arm and which spring acts on one sideof a predetermined position of said lever arm to move the latter to andmaintain the latter in a position wherein the friction wheel engages thegiriyir g member and functioning on the other side of said predeterminedposition to move the arm to and maintain it inct he inactive positionwherein the friction wheel is remotely located with respect to thedriving member. 4. A bobbin winder for a sewing machine comprising alever pivotably mounted at one end to the head of a amaqhi eandprevi slskit ntberettibtith a rotatable spindle adapted to rnonnt a bobbin, afriction wheel attached to said spindle and-adaptedto' be moved by saidlever arm between an inactive position away from a driving membermounted on the head of the sewing machine n pper ing po on whe ein sa dheelen t e vin em pringmeansmnn etcd o the-s ng ch he n o l ver-a m.andzf ns ioni s to move the latter ,to and maintain it in p V whereinthe friction wheel engages athe driving member and functioning on theother side of said predetermined position to move the same to andmaintain it inthe inaetive position of the friction wheel away. fromtherlriving mem er d 1 ak ng elem nta qh d to the he d .o the sewingmachine and adapted to bear against material o n v p the-ba bin hen-i raches .a p edet rmin d i m t n wh ch up mn in ed bt t qnbfi t b bbinforces the friction wheel away from its driving mem- 4. t l th fr tionaldriving engagement therebetween lsexceeded by ra n r ct on, b een the. bak ng e ement and th material woundnpon the bobbin whereupon therotation of the bobbin ceases.

' References Cited in the file of this patent UNITED STATES, PATENTS575,587 Borton Jan. 19, 189.7 2,190,760 Anderson Feb. 20, 1940 FORE GrATE I 3,686 :Germany Apr. 12, 18.78

